.outer {
    padding: 20px;
    background-color: #f0f0f0;
}

.middle {
    padding: 20px;
    background-color: #ccc;
}

.inner {
    padding: 20px;
    background-color: #4CAF50;
    color: white;
    text-align: center;
}

ul {
    border: 2px solid #4CAF50;
    padding: 20px;
    border-radius: 8px;
    background: #f8f8f8;
    max-width: 300px;
    margin: 30px auto;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

li {
    padding: 12px;
    margin: 8px 0;
    background: white;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.2s;
    list-style-type: none;
    border-left: 4px solid #4CAF50;
}

li:hover {
    background: #f0f0f0;
    transform: translateX(5px);
}

#out {
    padding: 20px;
    background-color: #f0f0f0;
}

#in {
    padding: 20px;
    background-color: #57af4c;
}

#div3 {
    height: 50px;
    background-color: antiquewhite;
    text-align: center;
}